[PATCH 6/9] drm/i915: Rip out legacy page_flip completion/irq handling
Daniel Vetter
daniel.vetter at ffwll.ch
Wed Jul 19 12:54:59 UTC 2017
All these races and things are now solved through the vblank evasion
trick, plus event handling is done using normal vblank even processing
and drm_crtc_arm_vblank_event. We can get rid of all this complexity.
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
drivers/gpu/drm/i915/i915_irq.c | 151 ++++--------------------
drivers/gpu/drm/i915/intel_display.c | 215 -----------------------------------
drivers/gpu/drm/i915/intel_drv.h | 3 -
3 files changed, 22 insertions(+), 347 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index f0cb278cee8b..b64c89e0fbf1 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1708,18 +1708,6 @@ static void gen9_guc_irq_handler(struct drm_i915_private *dev_priv, u32 gt_iir)
}
}
-static bool intel_pipe_handle_vblank(struct drm_i915_private *dev_priv,
- enum pipe pipe)
-{
- bool ret;
-
- ret = drm_handle_vblank(&dev_priv->drm, pipe);
- if (ret)
- intel_finish_page_flip_mmio(dev_priv, pipe);
-
- return ret;
-}
-
static void valleyview_pipestat_irq_ack(struct drm_i915_private *dev_priv,
u32 iir, u32 pipe_stats[I915_MAX_PIPES])
{
@@ -1784,12 +1772,8 @@ static void valleyview_pipestat_irq_handler(struct drm_i915_private *dev_priv,
enum pipe pipe;
for_each_pipe(dev_priv, pipe) {
- if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS &&
- intel_pipe_handle_vblank(dev_priv, pipe))
- intel_check_page_flip(dev_priv, pipe);
-
- if (pipe_stats[pipe] & PLANE_FLIP_DONE_INT_STATUS_VLV)
- intel_finish_page_flip_cs(dev_priv, pipe);
+ if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS)
+ drm_handle_vblank(&dev_priv->drm, pipe);
if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
i9xx_pipe_crc_irq_handler(dev_priv, pipe);
@@ -2241,19 +2225,14 @@ static void ilk_display_irq_handler(struct drm_i915_private *dev_priv,
DRM_ERROR("Poison interrupt\n");
for_each_pipe(dev_priv, pipe) {
- if (de_iir & DE_PIPE_VBLANK(pipe) &&
- intel_pipe_handle_vblank(dev_priv, pipe))
- intel_check_page_flip(dev_priv, pipe);
+ if (de_iir & DE_PIPE_VBLANK(pipe))
+ drm_handle_vblank(&dev_priv->drm, pipe);
if (de_iir & DE_PIPE_FIFO_UNDERRUN(pipe))
intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
if (de_iir & DE_PIPE_CRC_DONE(pipe))
i9xx_pipe_crc_irq_handler(dev_priv, pipe);
-
- /* plane/pipes map 1:1 on ilk+ */
- if (de_iir & DE_PLANE_FLIP_DONE(pipe))
- intel_finish_page_flip_cs(dev_priv, pipe);
}
/* check event from PCH */
@@ -2315,13 +2294,8 @@ static void ivb_display_irq_handler(struct drm_i915_private *dev_priv,
intel_opregion_asle_intr(dev_priv);
for_each_pipe(dev_priv, pipe) {
- if (de_iir & (DE_PIPE_VBLANK_IVB(pipe)) &&
- intel_pipe_handle_vblank(dev_priv, pipe))
- intel_check_page_flip(dev_priv, pipe);
-
- /* plane/pipes map 1:1 on ilk+ */
- if (de_iir & DE_PLANE_FLIP_DONE_IVB(pipe))
- intel_finish_page_flip_cs(dev_priv, pipe);
+ if (de_iir & (DE_PIPE_VBLANK_IVB(pipe)))
+ drm_handle_vblank(&dev_priv->drm, pipe);
}
/* check event from PCH */
@@ -2502,7 +2476,7 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
}
for_each_pipe(dev_priv, pipe) {
- u32 flip_done, fault_errors;
+ u32 fault_errors;
if (!(master_ctl & GEN8_DE_PIPE_IRQ(pipe)))
continue;
@@ -2516,18 +2490,8 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
ret = IRQ_HANDLED;
I915_WRITE(GEN8_DE_PIPE_IIR(pipe), iir);
- if (iir & GEN8_PIPE_VBLANK &&
- intel_pipe_handle_vblank(dev_priv, pipe))
- intel_check_page_flip(dev_priv, pipe);
-
- flip_done = iir;
- if (INTEL_INFO(dev_priv)->gen >= 9)
- flip_done &= GEN9_PIPE_PLANE1_FLIP_DONE;
- else
- flip_done &= GEN8_PIPE_PRIMARY_FLIP_DONE;
-
- if (flip_done)
- intel_finish_page_flip_cs(dev_priv, pipe);
+ if (iir & GEN8_PIPE_VBLANK)
+ drm_handle_vblank(&dev_priv->drm, pipe);
if (iir & GEN8_PIPE_CDCLK_CRC_DONE)
hsw_pipe_crc_irq_handler(dev_priv, pipe);
@@ -3710,34 +3674,6 @@ static int i8xx_irq_postinstall(struct drm_device *dev)
/*
* Returns true when a page flip has completed.
*/
-static bool i8xx_handle_vblank(struct drm_i915_private *dev_priv,
- int plane, int pipe, u32 iir)
-{
- u16 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane);
-
- if (!intel_pipe_handle_vblank(dev_priv, pipe))
- return false;
-
- if ((iir & flip_pending) == 0)
- goto check_page_flip;
-
- /* We detect FlipDone by looking for the change in PendingFlip from '1'
- * to '0' on the following vblank, i.e. IIR has the Pendingflip
- * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence
- * the flip is completed (no longer pending). Since this doesn't raise
- * an interrupt per se, we watch for the change at vblank.
- */
- if (I915_READ16(ISR) & flip_pending)
- goto check_page_flip;
-
- intel_finish_page_flip_cs(dev_priv, pipe);
- return true;
-
-check_page_flip:
- intel_check_page_flip(dev_priv, pipe);
- return false;
-}
-
static irqreturn_t i8xx_irq_handler(int irq, void *arg)
{
struct drm_device *dev = arg;
@@ -3745,9 +3681,6 @@ static irqreturn_t i8xx_irq_handler(int irq, void *arg)
u16 iir, new_iir;
u32 pipe_stats[2];
int pipe;
- u16 flip_mask =
- I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
- I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
irqreturn_t ret;
if (!intel_irqs_enabled(dev_priv))
@@ -3761,7 +3694,7 @@ static irqreturn_t i8xx_irq_handler(int irq, void *arg)
if (iir == 0)
goto out;
- while (iir & ~flip_mask) {
+ while (iir) {
/* Can't rely on pipestat interrupt bit in iir as it might
* have been cleared after the pipestat interrupt was received.
* It doesn't set the bit in iir again, but it still produces
@@ -3783,7 +3716,7 @@ static irqreturn_t i8xx_irq_handler(int irq, void *arg)
}
spin_unlock(&dev_priv->irq_lock);
- I915_WRITE16(IIR, iir & ~flip_mask);
+ I915_WRITE16(IIR, iir);
new_iir = I915_READ16(IIR); /* Flush posted writes */
if (iir & I915_USER_INTERRUPT)
@@ -3794,9 +3727,8 @@ static irqreturn_t i8xx_irq_handler(int irq, void *arg)
if (HAS_FBC(dev_priv))
plane = !plane;
- if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS &&
- i8xx_handle_vblank(dev_priv, plane, pipe, iir))
- flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane);
+ if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS)
+ drm_handle_vblank(&dev_priv->drm, pipe);
if (pipe_stats[pipe] & PIPE_CRC_DONE_INTERRUPT_STATUS)
i9xx_pipe_crc_irq_handler(dev_priv, pipe);
@@ -3896,45 +3828,11 @@ static int i915_irq_postinstall(struct drm_device *dev)
return 0;
}
-/*
- * Returns true when a page flip has completed.
- */
-static bool i915_handle_vblank(struct drm_i915_private *dev_priv,
- int plane, int pipe, u32 iir)
-{
- u32 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane);
-
- if (!intel_pipe_handle_vblank(dev_priv, pipe))
- return false;
-
- if ((iir & flip_pending) == 0)
- goto check_page_flip;
-
- /* We detect FlipDone by looking for the change in PendingFlip from '1'
- * to '0' on the following vblank, i.e. IIR has the Pendingflip
- * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence
- * the flip is completed (no longer pending). Since this doesn't raise
- * an interrupt per se, we watch for the change at vblank.
- */
- if (I915_READ(ISR) & flip_pending)
- goto check_page_flip;
-
- intel_finish_page_flip_cs(dev_priv, pipe);
- return true;
-
-check_page_flip:
- intel_check_page_flip(dev_priv, pipe);
- return false;
-}
-
static irqreturn_t i915_irq_handler(int irq, void *arg)
{
struct drm_device *dev = arg;
struct drm_i915_private *dev_priv = to_i915(dev);
u32 iir, new_iir, pipe_stats[I915_MAX_PIPES];
- u32 flip_mask =
- I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
- I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
int pipe, ret = IRQ_NONE;
if (!intel_irqs_enabled(dev_priv))
@@ -3945,7 +3843,7 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
iir = I915_READ(IIR);
do {
- bool irq_received = (iir & ~flip_mask) != 0;
+ bool irq_received = (iir) != 0;
bool blc_event = false;
/* Can't rely on pipestat interrupt bit in iir as it might
@@ -3980,7 +3878,7 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
i9xx_hpd_irq_handler(dev_priv, hotplug_status);
}
- I915_WRITE(IIR, iir & ~flip_mask);
+ I915_WRITE(IIR, iir);
new_iir = I915_READ(IIR); /* Flush posted writes */
if (iir & I915_USER_INTERRUPT)
@@ -3991,9 +3889,8 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
if (HAS_FBC(dev_priv))
plane = !plane;
- if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS &&
- i915_handle_vblank(dev_priv, plane, pipe, iir))
- flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane);
+ if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS)
+ drm_handle_vblank(&dev_priv->drm, pipe);
if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
blc_event = true;
@@ -4026,7 +3923,7 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
*/
ret = IRQ_HANDLED;
iir = new_iir;
- } while (iir & ~flip_mask);
+ } while (iir);
enable_rpm_wakeref_asserts(dev_priv);
@@ -4161,9 +4058,6 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
u32 iir, new_iir;
u32 pipe_stats[I915_MAX_PIPES];
int ret = IRQ_NONE, pipe;
- u32 flip_mask =
- I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
- I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
if (!intel_irqs_enabled(dev_priv))
return IRQ_NONE;
@@ -4174,7 +4068,7 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
iir = I915_READ(IIR);
for (;;) {
- bool irq_received = (iir & ~flip_mask) != 0;
+ bool irq_received = (iir) != 0;
bool blc_event = false;
/* Can't rely on pipestat interrupt bit in iir as it might
@@ -4212,7 +4106,7 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
i9xx_hpd_irq_handler(dev_priv, hotplug_status);
}
- I915_WRITE(IIR, iir & ~flip_mask);
+ I915_WRITE(IIR, iir);
new_iir = I915_READ(IIR); /* Flush posted writes */
if (iir & I915_USER_INTERRUPT)
@@ -4221,9 +4115,8 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
notify_ring(dev_priv->engine[VCS]);
for_each_pipe(dev_priv, pipe) {
- if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS &&
- i915_handle_vblank(dev_priv, pipe, pipe, iir))
- flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(pipe);
+ if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS)
+ drm_handle_vblank(&dev_priv->drm, pipe);
if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
blc_event = true;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 4762f158032d..02620f31374b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3405,14 +3405,6 @@ static void skylake_disable_primary_plane(struct intel_plane *primary,
spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
}
-static void intel_complete_page_flips(struct drm_i915_private *dev_priv)
-{
- struct intel_crtc *crtc;
-
- for_each_intel_crtc(&dev_priv->drm, crtc)
- intel_finish_page_flip_cs(dev_priv, crtc->pipe);
-}
-
static int
__intel_display_resume(struct drm_device *dev,
struct drm_atomic_state *state,
@@ -3525,13 +3517,6 @@ void intel_finish_reset(struct drm_i915_private *dev_priv)
if (!state)
goto unlock;
- /*
- * Flips in the rings will be nuked by the reset,
- * so complete all pending flips so that user space
- * will get its events and not get stuck.
- */
- intel_complete_page_flips(dev_priv);
-
dev_priv->modeset_restore_state = NULL;
/* reset doesn't touch the display */
@@ -10131,140 +10116,6 @@ static void intel_crtc_destroy(struct drm_crtc *crtc)
kfree(intel_crtc);
}
-/* Is 'a' after or equal to 'b'? */
-static bool g4x_flip_count_after_eq(u32 a, u32 b)
-{
- return !((a - b) & 0x80000000);
-}
-
-static bool __pageflip_finished_cs(struct intel_crtc *crtc,
- struct intel_flip_work *work)
-{
- struct drm_device *dev = crtc->base.dev;
- struct drm_i915_private *dev_priv = to_i915(dev);
-
- if (abort_flip_on_reset(crtc))
- return true;
-
- /*
- * The relevant registers doen't exist on pre-ctg.
- * As the flip done interrupt doesn't trigger for mmio
- * flips on gmch platforms, a flip count check isn't
- * really needed there. But since ctg has the registers,
- * include it in the check anyway.
- */
- if (INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv))
- return true;
-
- /*
- * BDW signals flip done immediately if the plane
- * is disabled, even if the plane enable is already
- * armed to occur at the next vblank :(
- */
-
- /*
- * A DSPSURFLIVE check isn't enough in case the mmio and CS flips
- * used the same base address. In that case the mmio flip might
- * have completed, but the CS hasn't even executed the flip yet.
- *
- * A flip count check isn't enough as the CS might have updated
- * the base address just after start of vblank, but before we
- * managed to process the interrupt. This means we'd complete the
- * CS flip too soon.
- *
- * Combining both checks should get us a good enough result. It may
- * still happen that the CS flip has been executed, but has not
- * yet actually completed. But in case the base address is the same
- * anyway, we don't really care.
- */
- return (I915_READ(DSPSURFLIVE(crtc->plane)) & ~0xfff) ==
- crtc->flip_work->gtt_offset &&
- g4x_flip_count_after_eq(I915_READ(PIPE_FLIPCOUNT_G4X(crtc->pipe)),
- crtc->flip_work->flip_count);
-}
-
-static bool
-__pageflip_finished_mmio(struct intel_crtc *crtc,
- struct intel_flip_work *work)
-{
- /*
- * MMIO work completes when vblank is different from
- * flip_queued_vblank.
- *
- * Reset counter value doesn't matter, this is handled by
- * i915_wait_request finishing early, so no need to handle
- * reset here.
- */
- return intel_crtc_get_vblank_counter(crtc) != work->flip_queued_vblank;
-}
-
-
-static bool pageflip_finished(struct intel_crtc *crtc,
- struct intel_flip_work *work)
-{
- if (!atomic_read(&work->pending))
- return false;
-
- smp_rmb();
-
- if (is_mmio_work(work))
- return __pageflip_finished_mmio(crtc, work);
- else
- return __pageflip_finished_cs(crtc, work);
-}
-
-void intel_finish_page_flip_cs(struct drm_i915_private *dev_priv, int pipe)
-{
- struct drm_device *dev = &dev_priv->drm;
- struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
- struct intel_flip_work *work;
- unsigned long flags;
-
- /* Ignore early vblank irqs */
- if (!crtc)
- return;
-
- /*
- * This is called both by irq handlers and the reset code (to complete
- * lost pageflips) so needs the full irqsave spinlocks.
- */
- spin_lock_irqsave(&dev->event_lock, flags);
- work = crtc->flip_work;
-
- if (work != NULL &&
- !is_mmio_work(work) &&
- pageflip_finished(crtc, work))
- page_flip_completed(crtc);
-
- spin_unlock_irqrestore(&dev->event_lock, flags);
-}
-
-void intel_finish_page_flip_mmio(struct drm_i915_private *dev_priv, int pipe)
-{
- struct drm_device *dev = &dev_priv->drm;
- struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
- struct intel_flip_work *work;
- unsigned long flags;
-
- /* Ignore early vblank irqs */
- if (!crtc)
- return;
-
- /*
- * This is called both by irq handlers and the reset code (to complete
- * lost pageflips) so needs the full irqsave spinlocks.
- */
- spin_lock_irqsave(&dev->event_lock, flags);
- work = crtc->flip_work;
-
- if (work != NULL &&
- is_mmio_work(work) &&
- pageflip_finished(crtc, work))
- page_flip_completed(crtc);
-
- spin_unlock_irqrestore(&dev->event_lock, flags);
-}
-
static inline void intel_mark_page_flip_active(struct intel_crtc *crtc,
struct intel_flip_work *work)
{
@@ -10275,72 +10126,6 @@ static inline void intel_mark_page_flip_active(struct intel_crtc *crtc,
atomic_set(&work->pending, 1);
}
-static bool __pageflip_stall_check_cs(struct drm_i915_private *dev_priv,
- struct intel_crtc *intel_crtc,
- struct intel_flip_work *work)
-{
- u32 addr, vblank;
-
- if (!atomic_read(&work->pending))
- return false;
-
- smp_rmb();
-
- vblank = intel_crtc_get_vblank_counter(intel_crtc);
- if (work->flip_ready_vblank == 0) {
- if (work->flip_queued_req &&
- !i915_gem_request_completed(work->flip_queued_req))
- return false;
-
- work->flip_ready_vblank = vblank;
- }
-
- if (vblank - work->flip_ready_vblank < 3)
- return false;
-
- /* Potential stall - if we see that the flip has happened,
- * assume a missed interrupt. */
- if (INTEL_GEN(dev_priv) >= 4)
- addr = I915_HI_DISPBASE(I915_READ(DSPSURF(intel_crtc->plane)));
- else
- addr = I915_READ(DSPADDR(intel_crtc->plane));
-
- /* There is a potential issue here with a false positive after a flip
- * to the same address. We could address this by checking for a
- * non-incrementing frame counter.
- */
- return addr == work->gtt_offset;
-}
-
-void intel_check_page_flip(struct drm_i915_private *dev_priv, int pipe)
-{
- struct drm_device *dev = &dev_priv->drm;
- struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
- struct intel_flip_work *work;
-
- WARN_ON(!in_interrupt());
-
- if (crtc == NULL)
- return;
-
- spin_lock(&dev->event_lock);
- work = crtc->flip_work;
-
- if (work != NULL && !is_mmio_work(work) &&
- __pageflip_stall_check_cs(dev_priv, crtc, work)) {
- WARN_ONCE(1,
- "Kicking stuck page flip: queued at %d, now %d\n",
- work->flip_queued_vblank, intel_crtc_get_vblank_counter(crtc));
- page_flip_completed(crtc);
- work = NULL;
- }
-
- if (work != NULL && !is_mmio_work(work) &&
- intel_crtc_get_vblank_counter(crtc) - work->flip_queued_vblank > 1)
- intel_queue_rps_boost_for_request(work->flip_queued_req);
- spin_unlock(&dev->event_lock);
-}
-
/**
* intel_wm_need_update - Check whether watermarks need updating
* @plane: drm plane
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a8834daf5c07..04f80b013db9 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1408,9 +1408,6 @@ void intel_unpin_fb_vma(struct i915_vma *vma);
struct drm_framebuffer *
intel_framebuffer_create(struct drm_i915_gem_object *obj,
struct drm_mode_fb_cmd2 *mode_cmd);
-void intel_finish_page_flip_cs(struct drm_i915_private *dev_priv, int pipe);
-void intel_finish_page_flip_mmio(struct drm_i915_private *dev_priv, int pipe);
-void intel_check_page_flip(struct drm_i915_private *dev_priv, int pipe);
int intel_prepare_plane_fb(struct drm_plane *plane,
struct drm_plane_state *new_state);
void intel_cleanup_plane_fb(struct drm_plane *plane,
--
2.13.2
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